在顶部添加UILabel作为UITextField的子视图
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我正在实施UILabel
作为UITextField
的子视图,它将显示在UITextField
本身的正上方。 UITextField
有一个圆形边界,我想要实现的是在边界上显示的UILabel
。
目前所有东西都按预期工作,但是UILabel
是在UITextField的边界后面绘制的。我希望它在边界“上方”(上方),以便白色backgroundColor显示在边框的上方,使文本更容易读取。
var priceTextField: CustomTextField = {
let priceTextField = CustomTextField()
priceTextField.layer.cornerRadius = 10.0
priceTextField.layer.borderWidth = 1.0
priceTextField.layer.borderColor = UIColor.darkGray.cgColor
priceTextField.translatesAutoresizingMaskIntoConstraints = false
priceTextField.font = UIFont.systemFont(ofSize: 15)
priceTextField.textColor = .black
priceTextField.text = "0"
priceTextField.suffix = "EUR"
priceTextField.suffixTextColor = .darkGray
priceTextField.suffixSpacing = 2.0
priceTextField.textAlignment = .center
priceTextField.labelText = "Price"
return priceTextField
}()
在我的CustomTextField类(UITextField的子类)中:
public var labelText: String?
var topLabel: UILabel = {
let topLabel = UILabel()
topLabel.translatesAutoresizingMaskIntoConstraints = false
topLabel.textAlignment = .center
topLabel.font = UIFont.systemFont(ofSize: 12)
topLabel.textColor = .lightGray
topLabel.backgroundColor = .white
topLabel.numberOfLines = 1
return topLabel
}()
func setupLabel() {
self.addSubview(topLabel)
topLabel.centerYAnchor.constraint(equalTo: self.topAnchor).isActive = true
topLabel.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 20).isActive = true
topLabel.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -20).isActive = true
topLabel.text = labelText
}
我在setupLabel()
的draw(_ rect: CGRect)
方法结束时调用UITextField
(因为我使用它来显示EUR符号总是在输入的值后面)。
我试图玩bringSubviewToFront
和改变zPosition
层的UILabel
,没有成功。
它现在看起来像这样:
如何将文本“置于”顶部的“上方”?
编辑:尝试了Sh_Khan的解决方案,但它仍然隐藏在边境后面。
import Foundation
import UIKit
public class CustomTextView: UIView, UITextFieldDelegate {
public var labelText: String?
var customTextField: CustomTextField = {
let customTextField = CustomTextField()
customTextField.translatesAutoresizingMaskIntoConstraints = false
customTextField.font = UIFont.systemFont(ofSize: 15)
customTextField.textColor = .black
customTextField.textAlignment = .center
customTextField.text = "0"
customTextField.suffix = "EUR"
customTextField.suffixTextColor = .lightGray
customTextField.suffixSpacing = 2.0
return customTextField
}()
var topLabel: UILabel = {
let topLabel = UILabel()
topLabel.translatesAutoresizingMaskIntoConstraints = false
topLabel.font = UIFont.systemFont(ofSize: 12)
topLabel.textColor = .darkGray
topLabel.numberOfLines = 1
topLabel.backgroundColor = .red
topLabel.textAlignment = .center
return topLabel
}()
override public init(frame: CGRect) {
super.init(frame: frame)
setupBorders()
}
public override func layoutSubviews() {
setupViews()
}
func setupBorders() {
self.layer.cornerRadius = 10.0
self.layer.borderColor = UIColor.lightGray.cgColor
self.layer.borderWidth = 1.0
}
func setupViews() {
addSubview(topLabel)
// insertSubview(topLabel, aboveSubview: customTextField)
insertSubview(customTextField, belowSubview: topLabel)
customTextField.topAnchor.constraint(equalTo: topAnchor).isActive = true
customTextField.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
customTextField.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
customTextField.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
topLabel.centerYAnchor.constraint(equalTo: topAnchor).isActive = true
topLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 10).isActive = true
topLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -10).isActive = true
topLabel.text = labelText
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupViews()
}
}
您可以尝试通过创建UIView子类来组织它,因此一切都按照添加的顺序正确显示
class CustomView: UIView {
var priceTextField: CustomTextField = {
let priceTextField = CustomTextField()
priceTextField.layer.cornerRadius = 10.0
priceTextField.layer.borderWidth = 1.0
priceTextField.layer.borderColor = UIColor.darkGray.cgColor
priceTextField.translatesAutoresizingMaskIntoConstraints = false
priceTextField.font = UIFont.systemFont(ofSize: 15)
priceTextField.textColor = .black
priceTextField.text = "0"
priceTextField.suffix = "EUR"
priceTextField.suffixTextColor = .darkGray
priceTextField.suffixSpacing = 2.0
priceTextField.textAlignment = .center
priceTextField.labelText = "Price"
return priceTextField
}()
var topLabel: UILabel = {
let topLabel = UILabel()
topLabel.translatesAutoresizingMaskIntoConstraints = false
topLabel.textAlignment = .center
topLabel.font = UIFont.systemFont(ofSize: 12)
topLabel.textColor = .lightGray
topLabel.backgroundColor = .white
topLabel.numberOfLines = 1
return topLabel
}()
var lableStr:String?
init(frame: CGRect,lblTex:String) {
super.init(frame: frame)
lableStr = lblTex
createSubviews()
}
override init(frame: CGRect) {
super.init(frame: frame)
createSubviews()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
createSubviews()
}
func createSubviews() {
// all the layout code from above
// add the textfield then the label and set constraints properly
}
}
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